Pneumatic load-compensator for motor-driven vehicles.



, 11. T. M cnossoN. I PNEUMATIC LOAD COMPENSATOR FOR MOTOR DRIVENVEHICLES.

APPUCATION FILED MAR. 27 I915.

Patentd Apr.. 11, 1916.

2 SHEETS-SHEEI I;

J. T. MCCROSSON.

Patented Apr- 1 1916- 7 I I 2 SHEETS-SHEET 2- i a PATEN '7 I931,THoiaiis ivr onossol v 1 or HoivotULU, .trnnnrronzier "HAiirAiIfrnniiimrioLoAooo PENsAron F011;MoTo nRivEN'vEHIeLes. 3

179 01-5 l I v Specification of Letters Patent. 1 1-;

Y Application filed March 27, 1915. Serial No. 17,343. 1 7 '0 all whomit may mm; I

Be itkn'own'that IQJoHNTHOMAS -M-c- Fig. 1. r (Inossor'i. a citiien ofthe United States, re- Referring to the drawing, the" 'elll 10 I sidingat Honolulu, inxtlie county of Honoleaf spring 5'is secured between theframe 5 lulu and Territor ofHawa l iai'e invented and theaXle 7 ofthevehiclebytheflU b' certain new and insefnl li provements' inland 9passing throngh holeslin tl ie plat 10 Pneumatic.LoadsGompensatoi's;for; Motorand 11 respectively.v j: Thefleylinder-Driven Vehicle's; andyI do hereby'ideclare hinged above the plate 11' 'bthe following to bef"f11ll; demand exact ch p e ro gl thefe 1 1odescription of the invention such (as ijwill bottom'of said cylinderandthronghth' ltig' enable others skilled in *thei'art to which it 11 ontherplate'll. The pistoii lfladi ed appertain'sjjto make andnse;thesame;to slide in the cylinder ,;12,1,is S! v Thisinventionrelatesftojpiprovements in ing to the P111136 0 thep n'f-15motor-driven tracks or automobiles Hfor Passes through the ears lon'thalp 15 freight or pa'ssengei' s its: object; being to of saidpiston and throngh the luglo in provide inean s for ,ai-ltomaticallycompenplate 10; A leatheror other suitable 01'1 p; sating forthe loadionsuch zi -vehicle, so that 16 is secured between. the lower endgofth itssprings are maintained intheir-nornial p1 t0n'14and t o o e 0elainpplll" 1 working position independently of the load. The valrechamber 18, which. 'isadj 20 The invention fcohtemplates' pneumatic tothe cylinder 12 andmay becastintegr load compensating.means.interposedbetherewith, is proyided"withthepiston I tween theaxle or axlesand thebody or the '19" adapted to slideverticallyiiirsaid.,e frame of themotor-driyen veliicle. lVhen a. her.- The opening of port 20 conn'e loadis appliedtothe ehicle its springs are interior of theCylinderNIQW'iththe compressed,compressed. air is then auto-(:liamberIS; said port being near the bott matically admitted tothe-cylinders ofthe of said cylinder. The vane-ma 19 load compensator.1i the pressure on piston-valve 19 is provided with-{1.11391 theirpistons-is'suflicientjto raisetherframe gated hole 19?. i The hinge pin151's exte or body of the .truckand cause the springs ed and passes.through this hole '19", at of the vehicle to "return to their normalwasher21 is' placed on said pin on eacliside working position.WheITeupQnJthe supply of Of the "alVGd'Od 19, these washeislieincompressed airis automaticallycut off; The tained in place'by thecotter-pins 22. Con air under pressureqnow inthese cylinders pressed'airmay he admittedyto the ital: acts, together with.the'isprin-gs; tocushion chamber 18, from any suitable ,so lllbie on th theshocksoccasioned When the vehiclefiis vehicle, by means of the fieniblePpipe 23 cm! traveling'over an unevensurface. When nected to the nozzle18*. Ahrakejfmayjb the load or a part otf the loadis removed applied tothe piston-valve 19;; to i-eve from the vehicle, air is automaticallyper any improper movementv'ofsaidflvalye." fo mitted to escaperfrointhese cylinders; thus exan'lple, hy mcans of the friction block e9lowering the'pressure of the'lsame on. the pressed against thepiston-valvelll byt pistons, until the springsagainiassume their spring.25 interposed, between said frictr normal Working positions ander thenew block and the screw 2,6 in the boss l8"jon" t1 load conditions.-Thesp'ringsof the motor-, chamber 18. as shown. a 3 driven vehicleare.thusalways'dmaintained While the pneumatic load eompen. 't in theirnormal working position irrespee alrove described and illustratedinfth'edra tive of any changesmade'ih theload upon"; ing is confined to onespring ofithef xfnhipl the vehicle. l. f it is of course contemplatedthatjthe othe The invention. consistsTinprovidinglsuch spring or springsisor are to lie si" 'ilarl pneumaticmeans;for automatically com;- Iprovided. l eh pensatingfortheloadsionthe yehiclein an In operation. thepiston:14qslides1- 1nijth efficient and economical manner.

I, cylinder 12 with the movement (if the spri In theaccompanyingdrawing, formmg a which operates in the usual manine part ofthis specification,jFigure lrepre- -a load is applied toothe vehicleisents an inside elevation of-a portion of a frame '6 the spring 5 iscompress motor-driven truck illustratn'ig one embodlsuflicient load isadded the pinlii v e, v .P. ment of my HlVHltJlOn. 'fFlg. 2 irepresentsathe ralve-rodll. at the lmver end of tht hole 19 and forces thepiston-valve 19- downward, permitting compressed air supplied,

through the pipe 23 to be admitted through the port 2.0 into the clinder 12. The pres sure of the air thus a mitted causes the pis- 14 torise in the cylinder 12 and lift the frame 6 With its load, until thepin has engaged the rod 19 at the upper end'of the hole 19 and raisedthe piston-valve 19 sufficiently to again close the port and shut offthe supply of compressed air to'the cylinder 12. The spring 5 is nowback in its normal working position, the Weight of the added load on thevehicle being compensated for by the pressure of the air on the piston14, and the spring 5 is free to work within fixed limits Without anymovement of the piston-valve 19. When, however, the load is removed fromthe frame 6 this air prespin 15 lifts the piston-valve 19 until it unsure forces the piston 14 upward and the covers the port 20 and permitsair to escape to, the atmosphere from the cylinder 12 until the ressnreon the piston 14 is sufficiently owere'd to permit said piston todescend and the piston-valve 19 again covers the, port 20.

It will now be noted, that the pneumatic device described automaticallycompensates for any load on the vehicle, and that the always maintainedin their normal working position irrespective of any changes of load onthe vehicle. Of course, if preferred, the device may be inverted casethe cylinder 12 would be hinged to the plate 10 and the piston 14 wouldbe hinged v to the plate 11.

1 claim: 1. The combination With the chassis frame of a vehicle, therunning gear and the springs interposed between the two, of pneumaticmeans for maintaining the springs in their normal work ng positionirrespective pressed from that shown and described, in Whicha pistonvalve associated with said cylinder and having a slotted connection withone of said parts which Wlll permit limited relative movement betweensaid parts without moving said piston valve, and at least one port inthe cylinder wall to admit comair to and discharge it from the cylinder,said piston valve being designed to admit compressed air to the cylinderwhen the chassis frame moves toward the running gear and being designedto permit the compressed air to exhaust to when thechassis frame movesaway from the running gear.

2. The combination with the chassis frame of a vehicle, the running gearand the springs interposed bets-Jen the two, of pneumatic means formaintaining the springs in their normal. sgorking position irresrmctiveof the load comprising a cylinder and a piston interposed between thechassis frame and the running gear, a piston valve associated with saidcylinder and having a slotted connection with. the chassis frame, and asingle port'in the cylinder wall to admit compressed air to anddischarge it from the cylinder, said piston valve being designed toadmit compressed air to the cylinder through said port when the chassisframe moves toward the running gear and being designed to permitcompressed air to exhaust to the-atmosphere through said port when thechassis frame moves away from the running gear.

In testimony whereof I affix my signature in presence of two witnesses.

Rosa. J, PRATT, 1V. WEATHERBEE.

the atmosphere

